THE EFFECT OF COLLABORATIVE WRITING TECHNIQUE ON STUDENTS WRITING ABILITY AT THE EIGHTH GRADE OF SMP NEGERI 8 PEMATANGSIANTAR. jbl [Internet]. 28 April 2019 [dikutip 23 Februari 2026];1(1):26-31. Tersedia pada: https://jurnal.usi.ac.id/index.php/jbl/article/view/972